Electric needle.



G. H. MURPHY.

ELECTRIC NEEDLE.

APPLICATION FILED MAY 21, 1914.

Patented Feb. 9, 1915.

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THE NORRIS PETERS DOY. PHUTD-LITHU.. WASHINGTON. D, C.

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NllFED S11# GEORGE H. M UBPHY, OF REDDING, CALIFORNIA.

ELECTRIC NEEDLE.

Specication of Letters Patent.

Patented Feb. 9, 1915.

.Appeationfed May 21, 1914. Serial No. 840,043.

T0 all whom it may] concern.'

Be it known that I, GEORGE H. MURPHY, a citizen of the United States, residing at Bedding, in the county of Shasta and State of California, have invented certain new and useful improvements in Electric Needles, of which kthe following is a specificaticn, reference being had therein to the acccmpanying drawing.

rl'his invention relates to certain new and useful improvements in electric needles to be used for pyrcoraphic, surgical and cauterizing work; the object being to provide a needle which is exceedingly simple and cheap in construction, the point being formed separate and detachable therefrom in order vthat the same can be removed to allow it to be thoroughly cleaned.

Another and further object of the inventicn is to provide a needle which is composed of a series of concentric tubular members separated by insulating sleeves to provide a pair of ccnductors having leads connected thereto through which the electric current passes, the oppcsite ends of said conductors being connected by a point formed of a single piece of high resistance material, such as nichrcme, through which the current is adapted to pass for heating the point.

Other and further objects and advantages of the invention will be hereinafter set forth and the novel features thereof defined by the appended claims.

ln the drawing-Figure 1, is a longitudinal section through my improved construction of electric needle; Fig. 2, is a section taken cn the line 2-2 of Fig. 1; and Fig. 3, is an elevation of the point, showing the members constituting the same, separated.

Like numerals of reference refer to like parts in the several figures of the drawings.

In carrying out my invention, I employ a holder comprising a tapering, cylindrical tube l preferably formed of ber in which is arranged a split metal tube 2 preferably formed of brass forming a conductor which is provided at one end, with a lead 3.

The enlarged end of the holder l is annularly enlarged interiorly to form a space 4 between the tube 2 and the inner wall thereof, forming an annular tapering air jacket so as to prevent the holder from becoming het at the point at which the same is grasped by the operator in using the same, as will be hereinafter fully described.

Arranged within the brass tube 2 forming the conductor, is an insulating `tube 5 preferably formed ofmicain which is arranged a brass tube G forming a conductor which is also provided with a lead A7 at one end and to the leads and 7, areadaptedto be ccnnectcd. electric wires leading frcnra source of supply.

The insulating tube-5 is cut awayv at one end forming an annular chamber to receive the pen 9, the louter split tubes expanding to allow the point 9 to be inserted and after it has been inserted, the Ctubes contract so as to hold the same firmly in positionl whereby a point holder is formed by means of which. the point 9 can be easily and quickly inserted `or detached therefrom. It will be seen that the point contacts with the inner and outer conductors.

The point 9 is preferably formed of a single piece of high resistance material, preferably nichrome, having a centrally reduced portion, said point being folded back at the reduced portion upon itself, in order to form a substantially pen-shaped member between which a gen-shaped insulator l0 formed of mica, is arranged; said insulator extending throughout the entire length of the body of the point but terminating short of the point in order to allow the curved end thereof to become red hot by the electric ,current passing through the same, which is supplied from the conductors 2 and 6. rI`he body of the pen thus formed, is substantially circular in shape and fits between the inner and outer tube of the holder in such a manner that it is securely locked in position therein. By constructing a pen in this manner, the metal of which the pen is formed, is heated until it becomes incandescent which enables the same to be used for various purposes and in such a manner that the operator can readily manipulate the same. In connection with a pen of this construction, a platinum tip 11 can be employed which is secured thereon by any suitable means in order to allow the pen to be used for various purposes.

From the foregoing description, it will be seen that I have provided an electric needle which is provided with a holder formed of a series of concentric tubes, two of which form conductors which are separated by an insulating sleeve in such a manner that the point, when placed between the conductors, will be quickly heated to allow the same to be used.

I claim:

1. An electrical instrument, comprising a holder having spaced insulated conductors, a point arranged between said conductors formed ot' a single piece of metal bent upon itself to forni parallel portions, and an insulated member arranged between said parallel portions of said point.

2. An electrical instrument, comprising a holder composed of an outer shell of fiber material, having spaced cylindrical conductors arranged therein, said conductors being separated by cylindrical insulators, and a point formed of a single piece of metal bent into substantially pen-shape, arranged between said cylindrical conductors.

3. An electrical instrument, comprising a holder and a point, said point being formed of a single piece of resistance metal bent upon itself to form spaced pen-shaped members, and a pen-shaped insulating member arranged between said members.

4. An electric needle, comprising a tapering fibrous tube forming an outer shell, a cylindrical conductor arranged within said shell having a lead at one end, a cylindrical insulator arranged within said tube, a second conductor arranged Within said insulater having a lead at one end, and a point formed of parallel members insulated apart and connected at one end, arranged between said Conductors.

5. An electrical instrument, comprising a holder having spaced conductors and a point arranged between said conductors, said point comprising two substantially penshaped portions connected at one end and separated by a strip of insulation.

(3. In an electrical instrument, the combination with a holder having spaced cylindrical conductors, said holder having an annular air jacket at one end, and a pen point for connecting said conductors.

7. An electrical instrument, comprising a tapering outer shell having an enlarged bore at one end, a split cylindrical conductor arranged within said shell provided with a lead, a cylindrical insulating tube arranged Within said conductor, a cylindrical conductor arranged Within said insulating tube having a lead at one end, and a pen having its body portion formed of spaced members arranged between said conductors, said body portions being separated by an insulating strip.

8. An electrical instrument, comprising a holder composed of a pair of eoncentrically arranged tubular conductors, one of said conductors being split to form a spring pen gripping member, and a pen arranged between said concentrically arranged tubular conductors.

9. An electrical instrument, comprising a holder and a point, s aid point being formed of a single piece of tubular-shaped resistance metal having a reduced portion bent upon itself to form spaced pen-shaped members, and a pen-shaped insulating member arranged between said members.

In testimony whereof I aliix my signature in presence of two witnesses.

GEORGE H. MURPHY.

vWitnesses WM. FRANCK, OLUF OLSEN.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. C. 

